872439649 has 4 divisors (see below), whose sum is σ = 872821764. Its totient is φ = 872057536.

The previous prime is 872439647. The next prime is 872439653. The reversal of 872439649 is 946934278.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 715188049 + 157251600 = 26743^2 + 12540^2 .

It is a cyclic number.

It is not a de Polignac number, because 872439649 - 2¹ = 872439647 is a prime.

It is a super-2 number, since 2×872439649² = 1522301882294486402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 872439596 and 872439605.

It is not an unprimeable number, because it can be changed into a prime (872439641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187612 + ... + 192205.

It is an arithmetic number, because the mean of its divisors is an integer number (218205441).

Almost surely, 2^872439649 is an apocalyptic number.

It is an amenable number.

872439649 is a deficient number, since it is larger than the sum of its proper divisors (382115).

872439649 is a wasteful number, since it uses less digits than its factorization.

872439649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382114.

The product of its digits is 2612736, while the sum is 52.

The square root of 872439649 is about 29537.0893792872. The cubic root of 872439649 is about 955.5317703958.

The spelling of 872439649 in words is "eight hundred seventy-two million, four hundred thirty-nine thousand, six hundred forty-nine".